Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..540c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Feb. 1990, p. 540-546. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
12
Early Stars, Elliptical Galaxies, Galactic Structure, Metallicity, Spectral Methods, Brightness, Galactic Evolution, Surface Properties
Scientific paper
The main question posed in this investigation is whether spectral synthesis methods confirm the metallicity gradient suggested by the observed Mg2 gradients. To this end, the method of optimized spectral population synthesis is applied to spatially resolved spectroscopic data for a sample of six bright early-type galaxies. The data were obtained at Mont Megantic with a panoramic photon-counting system and cover the 4800-5500 A spectral interval and a spatial interval of more than one effective radius. An overall trend of decreasing metallicity with radial distance was found. The statistical significance of the mean metallicity gradient is consistent with the adopted Fe/H vs Mg2 calibration employed by Couture and Hardy (1988). The results lend confidence to the conclusion that Mg2 gradients are controlled mainly by metallicity. The requirements, limitations, and possible improvements of the method employed here are discussed.
Couture Jean
Hardy Eduardo
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